[Qt-interest] Qt Designer Custom Widgets

[Josh Knox]

Malyushytsky, Alex wrote:
>>> You want to make a QtDesigner plugin.
>>>       
>
> Above is wrong. 

No, its not wrong. 

It works fine to create widgets that can be displayed in Designer. I've 
done it many times.

The docs cover it very well. Here's another example, from the Qt docs:
http://doc.qt.nokia.com/4.7/designer-customwidgetplugin.html

Easy.

Promoting is easy too and might be appropriate for this case where the 
derived class still looks like a QTextEdit for layout purposes.

Either way works. A plugin makes your class a 1st class citizen in 
designer. Promotion lets another widget stand in its place for layout 
purposes.

Josh

> Plug-in is completely different from promotion feature.
> All promotion does - it includes header your class is defined in, into
> uic generated header and replace widget class name mentioned with operator new with your class name.
> plugin makes much more.
>
> As you mentioned you have to make sure that your CustomChatWindow.hpp is found.
>
> What path to specify?
>
> It is up to you, it just has to be correct path either relative or absolute, so that if placed in the
> generated by uic file ( for your file it probably will be ui_CustomChatWindow.h ) it will be found by C++ compiler.
> I would recommend avoiding absolute path.
>
> If all the files you mentioned (cpp, hpp ) are included in your project already and Include Directories (INCLUDEPATH) contains path to the folder with CustomChatWindow.hpp you can just specify CustomChatWindow.hpp . This will add #include "CustomChatWindow.hpp" to the uic generated header.
> Otherwise I would recommend specify relative path (make sure it is valid from the location of uic generated header ).
>
> Regards,
>   Alex
>
>
> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Josh Knox
> Sent: Monday, November 08, 2010 10:41 AM
> To: Alex Ivasyuv
> Cc: Qt Interest
> Subject: Re: [Qt-interest] Qt Designer Custom Widgets
>
> Alex Ivasyuv wrote:
> Hi,
>
> I need to implement customTextEditWidget of QTextEdit.
> I created custom class, which implements QTextEdit, called CustomChatWindow (cpp & hpp files).
>
> Now I would like to use this custom class in QT Designer.
>
> I found in docs, that I could use "Promote" feature, but when I do this, I get on app start the following error:
> "QFormBuilder was unable to create a custom widget of the class 'CustomChatWindow'; defaulting to base class 'QTextEdit'."
>
> I think issue in name of header file that you have to clarify in popup dialog
> http://doc.qt.nokia.com/4.7/images/designer-promoting-widgets.png ("Header file").
>
> I have CustomChatWindow.hpp & CustomChatWindow.cpp. And they lies in some subfolders.
> What should I pointed there? Relative or absolute path to header file? Or maybe only here header file name? If so, related of what...
>
> I found here a video http://www.youtube.com/watch?v=Yt-YCxgEnyw, but it's a custom widget created by Designer.
>
> Thanks,
>
>
>
>
> You want to make a QtDesigner plugin.
>
> See this:
>
> http://doc.qt.nokia.com/4.7/designer-creating-custom-widgets.html
>
> and this example:
>
> http://doc.qt.nokia.com/4.7/designer-customwidgetplugin.html
>
>
>
> Josh
>
>
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